Apple Inc.'s Macintosh OS X (pronounced "'''OS Ten'''") is the operating system distributed with Apple computers. It includes heavily used several programs by default, including [[Apple Mail]], a web browser called [[Apple Safari | Safari]], and an [[Apple Address Book]], and [[iCal]].

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== Cache files ==

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The cache is stored in multiple:

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{| class="wikitable"

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|-

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! Filename

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! Description

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|-

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| index

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| The index file

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|-

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| data_#

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| Data block files

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|-

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| f_######

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| (Separate) data stream file

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|}

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== Disk image types ==

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== Cache address ==

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The cache address is 4 bytes in size and consists of:

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{| class="wikitable"

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|-

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! offset

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! size

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! value

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! description

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|-

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| <i>If file type is 0 (Separate file)</i>

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|

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|

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|

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|-

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| 0.0

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| 28 bits

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|

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| File number <br> The value represents the value of # in f_######

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|-

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| <i>Else</i>

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|

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|

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|

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|-

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| 0.0

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| 16 bits

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|

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| Block number

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|-

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| 2.0

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| 8 bits

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|

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| File number (or file selector) <br> The value represents the value of # in data_#

In HFS+ date and time values are stored in an unsigned 32-bit integer containing the number of seconds since January 1, 1904 at 00:00:00 (midnight) UTC (GMT). This is slightly different from HFS where the date and time value are stored using the local time. The maximum representable date is February 6, 2040 at 06:28:15 UTC (GMT). The date values do not account for leap seconds. They do include a leap day in every year that is evenly divisible by four. This is sufficient given that the range of representable dates does not contain 1900 or 2100, neither of which have leap days. Also see: [http://web.archive.org/web/20090214212148/http://developer.apple.com/technotes/tn/tn1150.html Technical Note TN1150 - HFS Plus Volume Format]